<template>
  <div>
    <el-button type="info" size="mini" plain icon="el-icon-upload2" @click="handleImport">
      <!--按钮文本 默认为 导入-->
      <slot>导入</slot>
    </el-button>

    <!-- 导入对话框 -->
    <el-dialog :title="upload.title" :visible.sync="upload.open" width="400px">
      <el-upload
        ref="upload"
        :limit="1"
        accept=".xlsx, .xls"
        :headers="upload.headers"
        :action="upload.urlPre+ url + '?updateSupport=' + upload.updateSupport"
        :data="{extraParams: JSON.stringify(extraParams)}"
        :disabled="upload.isUploading"
        :on-progress="handleFileUploadProgress"
        :on-success="handleFileSuccess"
        :auto-upload="false"
        drag
      >
        <i class="el-icon-upload"></i>
        <div class="el-upload__text">
          将文件拖到此处，或
          <em>点击上传</em>
        </div>
        <div class="el-upload__tip" slot="tip">
          <template v-if="showUpdateCheckbox">
            <el-checkbox v-model="upload.updateSupport"/>
            是否更新已经存在的数据
          </template>
          <el-link type="info" style="font-size:12px" @click="importTemplate" v-if="importTemplateUrl">下载模板
          </el-link>
          <el-link type="info" style="font-size:12px" :href="frontImportTemplateUrl" v-if="frontImportTemplateUrl">
            下载模板
          </el-link>
        </div>
        <div class="el-upload__tip" style="color:red" slot="tip">提示：仅允许导入“xls”或“xlsx”格式文件！</div>
      </el-upload>
      <div slot="footer" class="dialog-footer">
        <el-button type="primary" @click="submitFileForm" v-loading.fullscreen.lock="upload.isUploading">确 定
        </el-button>
        <el-button @click="upload.open = false">取 消</el-button>
      </div>
    </el-dialog>
  </div>
</template>

<script>
import {getToken} from "@/utils/auth";
import request from "@/utils/request";
import {encrypt} from '@/utils/jsencrypt'

export default {
  name: "ImportExcelButton",
  props: {
    //上传数据接口
    url: String,
    //下载模板接口
    importTemplateUrl: String,
    //前端下载模板接口
    frontImportTemplateUrl: String,
    //其他参数; 执行上传时会将该参数JSON序列化后以 extraParams的形式传输
    extraParams: {
      type: Object,
      default() {
        return {};
      }
    },
    //是否显示更新
    showUpdateCheckbox: {
      type: Boolean,
      default: true
    }
  },
  data() {
    return {
      // 导入参数
      upload: {
        // 是否显示弹出层
        open: false,
        // 弹出层标题
        title: "",
        // 是否禁用上传
        isUploading: false,
        // 是否更新已经存在的数据
        updateSupport: 0,
        // 设置上传的请求头部
        headers: {
          Authorization: "Bearer " + getToken(),
          'Check-Nonce': '',
          'Check-Time': ''
        },
        // 上传的地址
        urlPre: process.env.VUE_APP_BASE_API,
      },
    };
  },
  methods: {
    /** 导入按钮操作 */
    handleImport() {
      this.upload.title = "数据导入";
      this.upload.open = true;
    },

    /** 下载模板操作 */
    importTemplate() {
      request({
        url: this.importTemplateUrl,
        method: 'get'
      }).then(response => {
        this.$download.name(response.msg);
      });
    },
    // 文件上传中处理
    handleFileUploadProgress(event, file, fileList) {
      this.upload.isUploading = true;
    },
    // 文件上传成功处理
    handleFileSuccess(response, file, fileList) {
      this.upload.open = false;
      this.upload.isUploading = false;
      this.$refs.upload.clearFiles();
      this.$alert(response.msg, "导入结果", {
          dangerouslyUseHTMLString: true,
          type: response.code == 200 ? 'success' : 'error'
        }
      );
      //操作完成事件
      this.$emit('success');
    },
    // 提交上传文件
    submitFileForm() {
      //设置表头： nonce校验
      let time = new Date().getTime();
      let headers = this.upload.headers;
      headers['Check-Nonce'] = encrypt(time+'');
      headers['Check-Time'] = time+'';

      this.$refs.upload.submit();
    },


  }
}
</script>

<style scoped>

</style>
